Positive SSL
    14.素養(4)
1 有一環形鐵芯,磁路長4公尺,繞有50匝線圈,並通過2A之電流,則其磁動勢為
A 100AT
B 25AT
C 200AT
D 50AT
ℱ = NI = 50×2 = 100AT